Vertical-shaft centrifugal pump.



No; 891,422. PATENTE-D JUNE 23, 1908. A. W. HUNSAKER. VERTIGAL SHAFT GBNTRIPUGAL PUMP.

APPLICATION FILED JAN. 22, 1906.

Yrias Arana* oFFIoizf ARCHIBALD w. HUNSAKER, or PoMeNii, oiiLIi'fonNiA.' f

VERTIC A11-SHAFT CENTRIFUGAL PUMP.

To all whom it ymay concern.;

Be it known that l', ARCHIBALD W, HUN- SAKER, a citizen of the United States, residing at Pomona, in the county of Los Angeles and State of California, have invented new and useful linproveinents in Vertical-Shaft Centrifuval Puin )s of which the following is n l i e 15.'varying conditions of suction and Iiftheads.`

(')tlier objects ,and advantages may appear from the siibjoined particular description.

I' do not liinit my i vention to the exact construction shown but may vary `the. construction and airaiigei'nents of parts without departing from the spirit of' the invention.

The accompanying; drawing illustrates. the invention, the same being a fragmental vertical mid section ol`1 a pump embodying the inventhm.

1 designates'the'shell of the pump having` v la bottom intake 3, a pmipheral outlet 4, an 'upper suction cham` inipcller chamber )er 5 abovetlie iinpeller chamber 2, a lower 30y eounterbalaiicingV suction chamber 6 below 'the iiiipeller chamber? and outside the intake v3, and also having ports 7 connecting the intake 3% and said lower suction chamber il; a balancingsuction pipej extending,r from thi` upper suction. chamber 5 to the intake 3; and an iinpeller 9 in the sliellbctween said upper and lower suction chambers 5, (i, and

provided with an upper head1() working in said` upper suction chamber 5, and with two 40 lower heads 11, 12 working in the intake 3 and in the lower suction chamber f3 respec-v tively, one head being,r adapted to'cut oil connect-ion. between the lower suction. chamber and the intake when the'impeller lowers, and

to open said connection when the inipell'er,

rises.. The u per suction chamber 5 is preferablyexten( ed upwardly aroundthe lower portion ol the shal't bearing 13 so as to Ac 'ive a suitable space above the iiiipel'ier to insure a water packing for theupper l'ace'ol' the iiiipeller or runner l).

l`he head 11 is constructed to move up and down across the ports 7 to open they saine. when the iiiipellcr rises and closing" saine when the inipcller lowers.

The outer lrim of' the head 12 is a working Spcification of Letters Patent. Application filed J afinar? 22, 1906. l Serial No. 297,235.

Vvent pressure from entering this invention is to construct Patented June 23, isos.

fit inside the chamber Gto practically presaid chamber from the impeller chamber .2 which is sub- `ject to the atniosplicrioand discharge pressure.

In practical operation when the impeller is rotated thus discharging water through the .outlet 4, the suction through the intake isI applied through the by-pass suction pipe i to somewhat relieve from atmospheric pressure that portion of the runner which-is ex? posed to ehamber,'thus allowingr the runner to move upward responsive to the pressure Y from chamber (3. When the runner lil'ts sufiicieiitly to open the ports 7 the pressurel'roin 6 is `relieved by below suction ol" the intake, vthus causing the ii'iipeller to'stop its upward travel and to establislian equilibrium witlta water beariiw lor the runner'. 'lhe intake 3 is practically an upward right `extension of the usual vertical suction pipe. and the ports 7 are radial openings therethrough and the inner lower hollow piston` headl 11 works up and down across said radial ports and thus controls the pressure in the chamber (i, thereby regulating the thrust ol' the im'peller.

The inner lower'piston, head 1i is hollow and forms a direct connection betweenthe intake and the interior oi'- the iin )eller l -By this construction lit is'niadel possi le to, take the suction vertically direct toltl'ie impeller through the bottoni thereofand yet perfectly balance tlie-'i'nipeller anirdits vertical shalt, chainriiig,r the directionoi tliestieam from a vertical course onlyy it passes through the impeller. l

ln manufacturing these puni s, the ydia-v nietiieal proportions of the cii'cii ai' heads 1() and 1 1 will be determined l'ordiil'ci'ent maxi# muinweights of sha-i t by calculating the lil't of the eilective vacuum that willbe produced in the chambers 5 and-6 by the. operationy of thepiinip.. I have made a practice ol liguring such eil'cctive vacuum at ten poundsvper square ineli, and in ake 'such a` diil'ei'ence in the cross-sectional area of the two heads as will equal, at the. 'ato ol ten pounds pressure per square inch, ilic Weight oll the shall-ing to be upheld by tliorunner in operai-ion, and I .[ind that that rulel ailoids satisfactory i'osults regardless ol the diameter or crossseetional area ol the chamber (3.

l. A veitical shalt centi ilugalpunip comprising a shell havaner an iinpeller eluiniber,

a bottom intake, a peril heral outlet, an

upper, suction chamber a ove the` im eller chanibehia counterbalancin lsuction c amber below the'im eller chamer and outside the intake', and a so having ports connecting -the intake and said lower Ycounterbalancing chamber, a balancingsuction pipe extending A'from the. upper suction chamber to .the intake; and an impeller in the shell between said suction 'and 'lower counterbalancing chambers fand provided with an upper head i. working in'. said suction chamber, and with .two' lower heads Working in the intake and in 15spectively, the one headi being'adapted to cut oflcommunication between the-pressure Chamberl and. the intake when the lm'pelle'r lowers, and to open said: communication 'Whenthe impeller. rises.

' 20 2. A vertical shaft centrifugal pump comprising a shell provided with a suction chamberend a pressure chamber on lopposite sides of the impeller chamber, the lSaInejben adapted to counterbalance the weight o` impeller and `shafting4 and the .end thrust caused by suction' anddischar e` heads; and an impeller provided with a ollow piston head which is constructed too 'en commun'- cation between the intake andq'the counterbalancing vpressure chamber when' the im- 30- pellerrises, and to close such communication. when the impeller lowers, said hollow pistonhead forming a direct connection ,between the intake and the interiorof 'the 'impellenr the. lower counterbalancing" chambers,Y re-V In' .testimony whe eof, I have hereunto set 35 my handat Los An lesGalifornia this 17th Iday of January 190 1. j-

' In presence 'of-lv JAMES' R. ToWNsEND, C. WILLIAMS. 

